超高負荷軸流タービン直線翼列内の二次流れ低減に関する実験的研究

（前縁フィレットの適用）

抄録

An increase of turbine blade loading by increasing blade turning angle is an effective method to improve the performance of a gas turbine, which also enables to reduce a gas turbine in size and weight. However, it inevitably intensifies the secondary flows due to the increase of pitchwise pressure gradient. The application of a fillet at the leading edge-endwall junction (LEF) is known to be effective for reducing the horseshoe vortex which is a predominant secondary flow. Since the pressure side-leg of the horseshoe vortex and the passage vortex have same sence of rotation and merge with each other, the LEF may also reduce the passage vortex. In this study, the LEF was applied to the ultra-highly loaded axial turbine linear cascade (UHLTC) with the allowable maximum turning angle of 160 degrees. The effectiveness of the LEF on the UHLTC was verified by performing the internal flow measurement and the oil flow visualization.